KHM-5M Cells

The KHM-5M cell line is an important model derived from a patient with undifferentiated thyroid carcinoma complicated by neutrophilia and malignant pleurisy. This cell line is characterized by its significant production of neutrophil chemotactic factors, specifically human interleukin 8 (IL-8) and granulocyte-macrophage colony-stimulating factor (GM-CSF). These factors are crucial in the recruitment and activation of neutrophils, which play a pivotal role in the immune response and inflammation. The KHM-5M cells were shown to possess extreme chemotactic activity, a trait that was substantiated through in vitro experiments using conditioned media from the cells and the modified Boyden chamber technique.

Additionally, KHM-5M cells were transplanted into nude rats, where the infiltration of neutrophils was observed in and around the transplanted tumor tissue. This finding underscores the relevance of KHM-5M as a model for studying the interactions between tumor cells and the immune microenvironment, particularly in relation to neutrophil recruitment and function. The cell line also serves as a valuable tool for investigating the molecular mechanisms underlying cytokine production in cancer and the subsequent modification of pathological features. Through DNA cloning techniques, the chemotactic activities attributed to IL-8 and GM-CSF were confirmed, solidifying the KHM-5M cell line as a significant resource for research into cytokine-driven tumor-immune interactions.